We do upgrade switches and socket outlets. Often as not it may, with an older home, involve swapping the old flush box in the wall. By upgrading to these, safety protected outlets and switches, it's a chance to see what condition the wiring is in as well.
NB** Unlike some cheap Chinese gear which is swamping the market, these are reasonably priced and conform to Australian AND New Zealand Standards ensuring yours and your family's protection. They also come with at least a 7 year warranty as backed by the supplier. There is also an option for a Slimline version depending on your decor and requirements.